| 摘要 |
1331960 Working at specified temperatures; making steel sheets NIPPON KOKAN KK 25 Nov 1970 [16 Dec 1969] 55995/70 Headings B3A and B3V [Also in Division C7] A cold rolled steel shaft for deep drawing is made by hot rolling an aluminium killed steel containing less than 0À08% C., less than 0À40% Mn and at least 0À02% Sol Al such that the finishing temperature is above 800‹ C., and coiling the rolled steel at 630-730‹ C. to permit precipitation of aluminium nitride but produce no increase in the amount of carbon in solid solution in the coiled strip, whereafter the steel is cold rolled and continuously annealed at a temperature between 650‹ C. and the A 3 point. In an example, a steel is hot rolled at a finishing temperature of 880‹C., coiled at 700‹C., reduced 80% in thickness by cold rolling, passed through a continuous annealer in 20- 300 seconds at 80 m.p.m. and finally temper rolled 1À2-1À5%. |
